I do know that sometimes there are little dust spots that promote a dark toning spot. If left like that, that spot grows and is not attractive and, hence, I believe would be a negative for its value.
Again, would need to see the coin to comment anything more.
Sometimes there is stuff left on a coin from the mint. A quarter in one of my silver Proof sets has gotten spots. It can also come from having someone sneeze or breath on it. Silvia can cause this. Usually nothing can be done to reverse this without leaving another sort of spot.
Retired dealer and avid collector of U.S. type coins, 19th century presidential campaign medalets and selected medals. In recent years I have been working on a set of British coins - at least one coin from each king or queen who issued pieces that are collectible. I am also collecting at least one coin for each Roman emperor from Julius Caesar to ... ?
You might try an acetone bath. I have no idea what the spots are without pictures, however, if they are organic, the acetone will remove them. Of course, depending on what they are, there could be remaining stains/marks even if they are removed. If they are not proofs, you may want to just replace them. Cheers, RickO
Comments
I do know that sometimes there are little dust spots that promote a dark toning spot. If left like that, that spot grows and is not attractive and, hence, I believe would be a negative for its value.
Again, would need to see the coin to comment anything more.
I've been told I tolerate fools poorly...that may explain things if I have a problem with you. Current ebay items - Nothing at the moment
I thought it was pretty common to dip BU Eagles when this happened.
A quick bath will normally remove those "black spots." However, nothing will remove those dreaded "milk spots."
I thought the "MAC" sticker does?
EAC 6024